Update CHANGELOG with notion of grouped reports

CHANGELOG.md

@@ -20,6 +20,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Optimistic update for actions in users module and fetching users after api function finished its execution
 - Relay management
 - Ability to fetch all statuses from a given instance
+- Grouped reports: now you can view reports, which are grouped by status (pagination is not implemented yet, though)
 
 ### Fixed